| Title |
Numerical Analysis of In-Tube Heat Transfer Coefficient of CO2-CH4 and CO2-N2 Mixture in Supercritical Conditions |
| Authors |
Sehyeon Ham ; Soochang Gong ; Rin Yun |
| DOI |
http://dx.doi.org/10.6110/KJACR.2018.30.11.518 |
| Keywords |
열전달계수 ; 전달물성 ; 전산유체해석 ; 이산화탄소 불순물 ; 이산화탄소 수송 Heat transfer coefficient ; Transport properties ; CFD ; CO2 impurities ; CO2 transportation |
| Abstract |
In this study, the effect of mixture mole fraction, mass flux, and operational pressure on the heat transfer coefficient in supercritical conditions was investigated using commercial CFD program of FLUENT for CCS (Carbon Capture & Storage) transporting process. Simulations were carried out with mole fractions of the impurities of CH4 and N2 at 1, 3, and 5%, the pressure at 80, 90, and 100 bar, and the mass flux at 200, 400, and 600 kg/m². The range of inlet temperatures were set to 10 K at 5 K interval based on the point where the maximum heat transfer coefficient was observed. For CO2, the maximum heat transfer coefficient was found at 308 K, the value was 5,270 W/m²?K. When the mole fraction of CH4 was 3%, it was 4,400 W/m²?K at 304.5 K. When mole fraction of N2 was 3%, it was 4,000 W/m²?K at 303 K. It was observed that as the mole fraction increases, the maximum heat transfer coefficient decrease, and the temperature at which it is maximum increases. It was confirmed that the type of impurities affect the heat transfer of the mixture. As the mass flux of mixture increase, the average heat transfer coefficient increases too. |